Income Taxes (Details) (EUR €) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Income Tax [Abstract]
U.S. Federal statutory rates on loss from operations	€ (2,077)	€ (3,583)
Effect of foreign statutory rate differences	99	84
Effect of exchange rate changes	(212)	(371)
Expiration/disallowance of net operating loss carry forwards	638	1,785
Permanent differences	(265)	866
Increase in valuation allowance	1,815	1,235
Other	5	(15)
Income tax provision	3	1
Components of Deferred Tax Assets [Abstract]
Licenses capitalized for United States tax purposes	1,080	1,212
License contract basis difference	0	0
IPR&D basis difference	(615)	(802)
Stock options	125	110
Other	0	0
Operating Loss Carry Forwards [Line Items]
Deferred tax asset, gross	19,298	17,696
Less valuation allowance for deferred tax asset	(19,298)	(17,696)
Net deferred tax asset	0	0
UNITED STATES
Operating Loss Carry Forwards [Line Items]
Net operating loss carry forwards	17,020	15,770
Estimated net operating loss carryforwards	50,061
UNITED STATES | 2013 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
UNITED STATES | 2014 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
UNITED STATES | 2015 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
UNITED STATES | 2016 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
UNITED STATES | 2018-2032 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	50,061
UNITED STATES | Perpetual [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
SWITZERLAND
Operating Loss Carry Forwards [Line Items]
Net operating loss carry forwards	897	781
Estimated net operating loss carryforwards	3,457
SWITZERLAND | 2013 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
SWITZERLAND | 2014 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
SWITZERLAND | 2015 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
SWITZERLAND | 2016 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	1,345
SWITZERLAND | 2017 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	1,246
SWITZERLAND | 2018-2032 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	866
SWITZERLAND | Perpetual [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
NETHERLANDS
Operating Loss Carry Forwards [Line Items]
Net operating loss carry forwards	611	447
Estimated net operating loss carryforwards	2,445
NETHERLANDS | 2013 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
NETHERLANDS | 2014 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
NETHERLANDS | 2015 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
NETHERLANDS | 2016 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
NETHERLANDS | 2017 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	741
NETHERLANDS | 2018-2032 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	1,704
NETHERLANDS | Perpetual [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
LUXEMBOURG
Operating Loss Carry Forwards [Line Items]
Net operating loss carry forwards	180	178
Estimated net operating loss carryforwards	819
LUXEMBOURG | 2013 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
LUXEMBOURG | 2014 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
LUXEMBOURG | 2015 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
LUXEMBOURG | 2016 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
LUXEMBOURG | 2018-2032 [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	0
LUXEMBOURG | Perpetual [Member]
Operating Loss Carry Forwards [Line Items]
Estimated net operating loss carryforwards	€ 819